Synthesis of modified layered double hydroxide of MgAl catalyst with Ba and Li for the biodiesel production

Zanjani, Nooshin Gholipour; Kamran-Pirzaman, Arash; Khalajzadeh, Marzieh

doi:10.1007/s10098-020-01860-9

Cited by 17 publications

(12 citation statements)

References 35 publications

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“…In the present study, we proposed Li 4 SiO 4 as another solid alkali catalyst for biodiesel production. The sol‐gel‐derived Li 4 SiO 4 efficiently drove the transesterification of methanol with soybean oil to a conversion of over 91%, which was comparable to other Li‐based catalysts such as MgAl/Li40% (conversion of 91.0%), 48 Li‐doped MgO (conversion of 93.9%), 41 and Li‐doped CaO (conversion of 90.0%) 49 . The Li 4 SiO 4 ‐catalyzed reaction reached the equilibrium state at 2 hours, which was shorter than that achieved by the catalysts MgAl/Li40% (8 hours), 48 Li‐Cb (3 hours), 45 Li‐doped CaO (3 hours), 49 and Li‐doped ceria loaded SBA‐15 (4 hours) 47 .…”

Section: Resultsmentioning

confidence: 60%

“…The sol‐gel‐derived Li 4 SiO 4 efficiently drove the transesterification of methanol with soybean oil to a conversion of over 91%, which was comparable to other Li‐based catalysts such as MgAl/Li40% (conversion of 91.0%), 48 Li‐doped MgO (conversion of 93.9%), 41 and Li‐doped CaO (conversion of 90.0%) 49 . The Li 4 SiO 4 ‐catalyzed reaction reached the equilibrium state at 2 hours, which was shorter than that achieved by the catalysts MgAl/Li40% (8 hours), 48 Li‐Cb (3 hours), 45 Li‐doped CaO (3 hours), 49 and Li‐doped ceria loaded SBA‐15 (4 hours) 47 . Moreover, the concentration of Li 4 SiO 4 used for biodiesel synthesis (6%, w/w) was lower than that of MgAl/Li40% (7%, w/w), 48 Li‐doped MgO (9%, w/w), 41 and Li‐doped ceria loaded SBA‐15 (10%, w/w) 47 .…”

Section: Resultsmentioning

confidence: 60%

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Sol‐gel synthesized lithium orthosilicate as a reusable solid catalyst for biodiesel production

Nguyen

Pan

et al. 2020

Intl J of Energy Research

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Summary Lithium orthosilicate (Li4SiO4) is a promising solid catalyst for biodiesel synthesis. However, Li4SiO4 is traditionally prepared by a solid‐state reaction, which results in the unstable activity for the reaction. In the present study, Li4SiO4 was successfully prepared using a simple sol‐gel method and employed as an efficient solid alkali catalyst for biodiesel synthesis. The molar ratio of precursors and calcination temperature were optimized for the synthesis of Li4SiO4 by using the sol‐gel method. The physical and chemical properties were determined using X‐ray diffraction, scanning electron microscopy, laser diffraction particle size, and thermogravimetric analysis. The as‐prepared Li4SiO4 catalyst had much smaller particle size, pore volume, and pore size, but higher surface area and basicity than Li4SiO4 catalyst prepared by the solid‐state reaction. It was then used to transesterify methanol and soybean oil into biodiesel. The effect of reaction factors (reaction time from 1 to 3 hours, catalyst concentration from 3 to 9%; molar ratio of methanol to oil from 6:1 to 18:1, and temperature from 55°C to 75°C) on the Li4SiO4‐catalyzed transesterification was systematically examined. The highest biodiesel conversion of 91% was reached under the following conditions: reaction time of 2 hours, Li4SiO4 concentration of 6%, 12:1 methanol:oil molar ratio, and temperature of 65°C. Notably, Li4SiO4 could be efficiently reused for at least 10 times without significant loss of its activity; this suggests that the sol‐gel synthesized Li4SiO4 is a potential solid alkali catalyst for biodiesel synthesis.

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Section: Resultsmentioning

confidence: 60%

Section: Resultsmentioning

confidence: 60%

Sol‐gel synthesized lithium orthosilicate as a reusable solid catalyst for biodiesel production

Nguyen

Pan

et al. 2020

Intl J of Energy Research

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“…X-ray diffraction (XRD) patterns were recorded on RigakuD/max2550VB/PC (Rigaku International Corporation, Tokyo, Japan), using CuKα radiation (λ = 0.154 nm) at 45 kV, 100 mA. The scanning range was from 10 • to 80 • (2θ) at a scan speed of 0.02 • /s [30]. X-ray photoelectron spectra (XPS) were recorded on ESCALAB 250.…”

Section: Characterization Methodsmentioning

confidence: 99%

β-Cyclodextrin-Calcium Complex Intercalated Hydrotalcites as Efficient Catalyst for Transesterification of Glycerol

Liu¹,

Yang²,

Xu³

2021

Catalysts

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β-cyclodextrin derivative intercalated MgAl-hydrotalcites (β-CD-Ca/LDH) was synthesized to convert glycerol into high value-added glycerol carbonate(GC) by transesterification of dimethyl carbonate (DMC) and glycerol in this paper. β-cyclodextrin-metal complexes and β-CD-Ca/LDH was characterized by XRD, FT-IR, SEM, XPS and nitrogen adsorption-desorption. The enrichment of organic reactants in the hydrophobic cavity of β-cyclodextrin improved the collision probability of reactants. The intercalation of β-cyclodextrin-calcium complex (β-CD-Ca) increased the pore size and basic strength of catalyst. The experiment results showed that the glycerol conversion was 93.7% and the GC yield was 91.8% catalyzed by β-CD-Ca/LDH when the molar ratio of DMC and glycerol was 3:1, the catalyst dosage was 4 wt.%, the reaction temperature was 75 °C and the reaction time was 100 min while the glycerol conversion was 49.4% and the GC yield was 48.6% catalyzed by MgAl-LDH under the same conditions.

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“…At present, the mainly reported solid base catalysts include metal oxides, hydrotalcite compounds, supported solid bases, and anion exchange resins. As a new type of functional materials, hydrotalcite and hydrotalcite-like compounds have been concerned by researchers because of their special layered structure, tunable composition, and structure [11].…”

Section: Introductionmentioning

confidence: 99%

3D Hollow Mg-Ca-Al Hydrotalcite-Like Compounds Doped with KF for Catalytic Transesterification

Yan

Zhang

et al. 2023

International Journal of Chemical Engineering

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Herein, a kind of three-dimensional hollow Mg-Ca-Al hydrotalcite-like compounds (HTLCs) microsphere was prepared by self-assembly of hydrotalcite-like nanosheets. Mg-Ca-Al HTLCs microsphere (MS) has large specific surface area and large pore size, and the modification of KF·2H2O increases numerous alkaline active sites on the surface of the catalyst. The prepared catalyst has excellent catalytic effect for the production of biodiesel by transesterification. Under the optimal conditions of the catalyst addition amount which accounts for 2% of the weight of oil, the biodiesel yield of the best catalyst is as high as 92% within 30 minutes. This article also provides a paradigm of a rational structural design for regulating the morphology of HTLCs.

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Synthesis of modified layered double hydroxide of MgAl catalyst with Ba and Li for the biodiesel production

Cited by 17 publications

References 35 publications

Sol‐gel synthesized lithium orthosilicate as a reusable solid catalyst for biodiesel production

Sol‐gel synthesized lithium orthosilicate as a reusable solid catalyst for biodiesel production

β-Cyclodextrin-Calcium Complex Intercalated Hydrotalcites as Efficient Catalyst for Transesterification of Glycerol

3D Hollow Mg-Ca-Al Hydrotalcite-Like Compounds Doped with KF for Catalytic Transesterification

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